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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: TypeTokenParser.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.reflect.TypeToken;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.lang.reflect.Method;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.lang.reflect.Type;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.lang.reflect.TypeVariable;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.ArrayList;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.List;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.regex.Matcher;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.parse.ParseContext;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>/**<a name="line.21"></a>
<span class="sourceLineNo">022</span> * Recreates {@link TypeToken}s from the output of {@link TypeToken#toString}.<a name="line.22"></a>
<span class="sourceLineNo">023</span> * Currently requires that no type variables or wildcards appear.<a name="line.23"></a>
<span class="sourceLineNo">024</span> */<a name="line.24"></a>
<span class="sourceLineNo">025</span>public class TypeTokenParser {<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>    private final ClassLoader loader;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>    private Method newParameterizedTypeMethod;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>    /**<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * Default constructor.<a name="line.32"></a>
<span class="sourceLineNo">033</span>     */<a name="line.33"></a>
<span class="sourceLineNo">034</span>    public TypeTokenParser() {<a name="line.34"></a>
<span class="sourceLineNo">035</span>        this(null);<a name="line.35"></a>
<span class="sourceLineNo">036</span>    }<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    /**<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * Primary constructor.<a name="line.39"></a>
<span class="sourceLineNo">040</span>     *<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * @param loader class loader to use for loading classes,<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *  or null for the current thread's {@linkplain Thread#getContextClassLoader context loader}<a name="line.42"></a>
<span class="sourceLineNo">043</span>     */<a name="line.43"></a>
<span class="sourceLineNo">044</span>    public TypeTokenParser(ClassLoader loader) {<a name="line.44"></a>
<span class="sourceLineNo">045</span>        if (loader == null)<a name="line.45"></a>
<span class="sourceLineNo">046</span>            loader = Thread.currentThread().getContextClassLoader();<a name="line.46"></a>
<span class="sourceLineNo">047</span>        this.loader = loader;<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    /**<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * Parse a {@link TypeToken} in string form.<a name="line.51"></a>
<span class="sourceLineNo">052</span>     *<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * @param string string to parse<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * @return parsed type<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * @throws IllegalArgumentException if the input is invalid<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * @throws ClassNotFoundException if a named class could not be found<a name="line.56"></a>
<span class="sourceLineNo">057</span>     */<a name="line.57"></a>
<span class="sourceLineNo">058</span>    public TypeToken&lt;?&gt; parse(String string) throws ClassNotFoundException {<a name="line.58"></a>
<span class="sourceLineNo">059</span>        final ParseContext ctx = new ParseContext(string);<a name="line.59"></a>
<span class="sourceLineNo">060</span>        final TypeToken&lt;?&gt; token = this.parse(new ParseContext(string));<a name="line.60"></a>
<span class="sourceLineNo">061</span>        ctx.skipWhitespace();<a name="line.61"></a>
<span class="sourceLineNo">062</span>        if (!ctx.isEOF())<a name="line.62"></a>
<span class="sourceLineNo">063</span>            throw new IllegalArgumentException("string contains trailing garbage at index " + ctx.getIndex());<a name="line.63"></a>
<span class="sourceLineNo">064</span>        return token;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * Parse a {@link TypeToken} in string form from a {@link ParseContext}.<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * Since the {@link TypeToken} string format is self-delimiting, not all of the input may be consumed.<a name="line.69"></a>
<span class="sourceLineNo">070</span>     *<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * @param ctx parse context<a name="line.71"></a>
<span class="sourceLineNo">072</span>     * @return parsed type<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * @throws IllegalArgumentException if the input is invalid<a name="line.73"></a>
<span class="sourceLineNo">074</span>     * @throws ClassNotFoundException if a named class could not be found<a name="line.74"></a>
<span class="sourceLineNo">075</span>     */<a name="line.75"></a>
<span class="sourceLineNo">076</span>    public TypeToken&lt;?&gt; parse(ParseContext ctx) throws ClassNotFoundException {<a name="line.76"></a>
<span class="sourceLineNo">077</span>        ctx.skipWhitespace();<a name="line.77"></a>
<span class="sourceLineNo">078</span>        final Matcher matcher = ctx.matchPrefix("[^,&lt;&gt;]+");<a name="line.78"></a>
<span class="sourceLineNo">079</span>        final String className = matcher.group();<a name="line.79"></a>
<span class="sourceLineNo">080</span>        final Class&lt;?&gt; cl = this.loader.loadClass(className);<a name="line.80"></a>
<span class="sourceLineNo">081</span>        final TypeVariable&lt;?&gt;[] typeParameters = cl.getTypeParameters();<a name="line.81"></a>
<span class="sourceLineNo">082</span>        ctx.skipWhitespace();<a name="line.82"></a>
<span class="sourceLineNo">083</span>        if (ctx.isEOF())<a name="line.83"></a>
<span class="sourceLineNo">084</span>            return TypeToken.of(cl);<a name="line.84"></a>
<span class="sourceLineNo">085</span>        ctx.skipWhitespace();<a name="line.85"></a>
<span class="sourceLineNo">086</span>        final ArrayList&lt;Type&gt; parameterTypes = new ArrayList&lt;&gt;(typeParameters.length);<a name="line.86"></a>
<span class="sourceLineNo">087</span>        if (ctx.peek() == '&lt;') {<a name="line.87"></a>
<span class="sourceLineNo">088</span>            ctx.read();<a name="line.88"></a>
<span class="sourceLineNo">089</span>            while (true) {<a name="line.89"></a>
<span class="sourceLineNo">090</span>                ctx.skipWhitespace();<a name="line.90"></a>
<span class="sourceLineNo">091</span>                parameterTypes.add(this.parse(ctx).getType());<a name="line.91"></a>
<span class="sourceLineNo">092</span>                ctx.skipWhitespace();<a name="line.92"></a>
<span class="sourceLineNo">093</span>                final int ch = ctx.read();<a name="line.93"></a>
<span class="sourceLineNo">094</span>                if (ch == '&gt;')<a name="line.94"></a>
<span class="sourceLineNo">095</span>                    break;<a name="line.95"></a>
<span class="sourceLineNo">096</span>                if (ch != ',')<a name="line.96"></a>
<span class="sourceLineNo">097</span>                    throw new IllegalArgumentException("unexpected character `" + ch + "' at index " + ctx.getIndex());<a name="line.97"></a>
<span class="sourceLineNo">098</span>            }<a name="line.98"></a>
<span class="sourceLineNo">099</span>        }<a name="line.99"></a>
<span class="sourceLineNo">100</span>        if (parameterTypes.size() != typeParameters.length) {<a name="line.100"></a>
<span class="sourceLineNo">101</span>            throw new IllegalArgumentException(cl + " has " + typeParameters.length + " generic type parameters but "<a name="line.101"></a>
<span class="sourceLineNo">102</span>              + parameterTypes.size() + " parameters were supplied");<a name="line.102"></a>
<span class="sourceLineNo">103</span>        }<a name="line.103"></a>
<span class="sourceLineNo">104</span>        return parameterTypes.isEmpty() ? TypeToken.of(cl) : this.newParameterizedType(cl, parameterTypes);<a name="line.104"></a>
<span class="sourceLineNo">105</span>    }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>    /**<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * Convert a raw class back into its generic type.<a name="line.108"></a>
<span class="sourceLineNo">109</span>     *<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * @param target raw class<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * @param params type parameters<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * @return generic {@link TypeToken} for {@code target}<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * @see &lt;a href="https://code.google.com/p/guava-libraries/issues/detail?id=1645"&gt;Guava Issue #1645&lt;/a&gt;<a name="line.113"></a>
<span class="sourceLineNo">114</span>     */<a name="line.114"></a>
<span class="sourceLineNo">115</span>    @SuppressWarnings("unchecked")<a name="line.115"></a>
<span class="sourceLineNo">116</span>    private &lt;T&gt; TypeToken&lt;? extends T&gt; newParameterizedType(Class&lt;T&gt; target, List&lt;Type&gt; params) {<a name="line.116"></a>
<span class="sourceLineNo">117</span>        Type type;<a name="line.117"></a>
<span class="sourceLineNo">118</span>        try {<a name="line.118"></a>
<span class="sourceLineNo">119</span>            if (this.newParameterizedTypeMethod == null) {<a name="line.119"></a>
<span class="sourceLineNo">120</span>                this.newParameterizedTypeMethod = Class.forName("com.google.common.reflect.Types", false, this.loader)<a name="line.120"></a>
<span class="sourceLineNo">121</span>                  .getDeclaredMethod("newParameterizedType", Class.class, Type[].class);<a name="line.121"></a>
<span class="sourceLineNo">122</span>                this.newParameterizedTypeMethod.setAccessible(true);<a name="line.122"></a>
<span class="sourceLineNo">123</span>            }<a name="line.123"></a>
<span class="sourceLineNo">124</span>            type = (Type)this.newParameterizedTypeMethod.invoke(null, target, params.toArray(new Type[params.size()]));<a name="line.124"></a>
<span class="sourceLineNo">125</span>        } catch (RuntimeException e) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>            throw e;<a name="line.126"></a>
<span class="sourceLineNo">127</span>        } catch (Exception e) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>            throw new RuntimeException("unexpected exception", e);<a name="line.128"></a>
<span class="sourceLineNo">129</span>        }<a name="line.129"></a>
<span class="sourceLineNo">130</span>        return (TypeToken&lt;T&gt;)TypeToken.of(type);<a name="line.130"></a>
<span class="sourceLineNo">131</span>    }<a name="line.131"></a>
<span class="sourceLineNo">132</span><a name="line.132"></a>
<span class="sourceLineNo">133</span>// Test method<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>    public static void main(String[] args) throws Exception {<a name="line.135"></a>
<span class="sourceLineNo">136</span>        final TypeTokenParser parser = new TypeTokenParser();<a name="line.136"></a>
<span class="sourceLineNo">137</span>        for (String arg : args)<a name="line.137"></a>
<span class="sourceLineNo">138</span>            System.out.println(parser.parse(new ParseContext(arg)));<a name="line.138"></a>
<span class="sourceLineNo">139</span>    }<a name="line.139"></a>
<span class="sourceLineNo">140</span>}<a name="line.140"></a>
<span class="sourceLineNo">141</span><a name="line.141"></a>




























































</pre>
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